chore: using const to replace string

[LinuxSuRen]

Signed-off-by: rick LinuxSuRen@users.noreply.github.com

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Fixes #

Please check the following list:

• [ ] Does the affected code have corresponding tests, e.g. unit test, E2E test?
• [ ] Does this change require a documentation update?
• [ ] Does this introduce breaking changes that would require an announcement or bumping the major version?
• [ ] Do all new files have an appropriate license header?

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 82.30%. Comparing base (bf18775) to head (44301c3).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1316 +/- ## ========================================== - Coverage 82.35% 82.30% -0.05% ========================================== Files 83 83 Lines 4036 4036 ========================================== - Hits 3324 3322 -2 - Misses 492 494 +2 Partials 220 220 ```

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[qweeah]

Thanks for contributing @LinuxSuRen.